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Retirement Plan (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Nov. 30, 2017 | Nov. 30, 2016 | Nov. 30, 2015
Retirement Benefits [Abstract] |  |  |
Company contributions to the plan | $ 2.1 | $ 2.5 | $ 2.4

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration